Question:
The length of a potentiometer wire is . A cell of emf E is balanced at a length /3 from the positive end of the wire. If the length of the wire is increased by /2. At what distance will the same cell give a balance point?
The length of a potentiometer wire is . A cell of emf E is balanced at a length /3 from the positive end of the wire. If the length of the wire is increased by /2. At what distance will the same cell give a balance point?
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Balance length is inversely proportional to total wire length.
Updated On: Mar 17, 2026
- 2/3
- /2
- /6
- 4/3
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The Correct Option is C
Solution and Explanation
Step 1: Potential gradient k 1/L.
Step 2: New length, L'=+()/(2)=(3)/(2)
Step 3: Balance length varies inversely with length, '=()/(3)×()/(L')=()/(6)
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